*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 February 01 08:33UTC Prepared by the Athens Space Weather Forecasting Center *********************************************************************** 1. Solar activity Solar activity was increasing during the past 24 hours. Solar Flux (10.7 cm) measured on 31.01.2019 at 20:00 UTC was 72 sfu. The background X-Ray flux is at the class A6 level. The geomagnetic field was at very quiet to minor storm levels on January 31. No obviously Earth directed CMEs were observed in available LASCO imagery. The Kp index now is at active levels with Kp=4. 2. Solar Wind Geomagnetic Activity Solar Wind speed from ACE: 520 km/s. Solar Wind speed from STEREO A: 440 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 3 nT south. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A new equatorial coronal hole (CH905) will be in Earth facing position on January 26 - February 1. A high speed stream of solar wind finally arrived on the first half of January 31, almost a half day later than our prediction. This high speed stream of solar wind triggered a minor (G1) geomagnetic storm. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at unsettled to active levels, with a chance for minor storm intervals, on February 1 and at quiet to unsettled levels on February 2-3 due to CH905 effects. Date Estimated Ap index Expected geom. storm 2019.02.01 14 G1 2019.02.02 09 - 2019.02.03 07 - *************************************************************************** Athens Space Weather Forecasting Center Physics Department, National & Kapodistrian University of Athens Athens Neutron Monitor Station A.NE.MO.S Tel.: +30 210 727 6901 email: spaceweather@phys.uoa.gr URL: http://spaceweather.phys.uoa.gr ***************************************************************************